private static final Map<String, String> INTERFACES = new HashMap<>();


    static {
        INTERFACES.put("srvsvc", srvsvc.getSyntax());
        INTERFACES.put("lsarpc", lsarpc.getSyntax());
        INTERFACES.put("samr", samr.getSyntax());
        INTERFACES.put("netdfs", netdfs.getSyntax());
        INTERFACES.put("netlogon", "12345678-1234-abcd-ef00-01234567cffb:1.0");

    private static HashMap INTERFACES;

    static {
        INTERFACES = new HashMap();
        INTERFACES.put("srvsvc", srvsvc.getSyntax());
        INTERFACES.put("lsarpc", lsarpc.getSyntax());
        INTERFACES.put("samr", samr.getSyntax());
        INTERFACES.put("netdfs", netdfs.getSyntax());
    }

    public static void addInterface(String name, String syntax)
    {
        INTERFACES.put(name, syntax);
    }

        Map<String, Expression> bySyntax = new HashMap<>();

        if (expressions != null && !expressions.isEmpty()) {
            for (Expression expression : expressions) {
                bySyntax.put(expression.getSyntax(), expression);
            }
        }

        return bySyntax;
    }

    private static ClassLoader initializeDocLoader() throws ExpressionDocumentationException {

                for ( java.util.Iterator it = expressions.iterator(); it.hasNext(); )
                {
                    Expression expr = (Expression) it.next();

                    expressionsBySyntax.put( expr.getSyntax(), expr );
                }
            }
        }

        return expressionsBySyntax;
    }

    public void flushExpressionsBySyntax()
    {
        expressionsBySyntax = null;
    }